Table of Content  
4.1 Thermionic Emission and Cathode Ray
4.2 Carthode Ray Oscilloscope
4.3 Semiconductor
4.4 Semiconductor Diode
4.5 Trasistor
4.6 Logic Gate

Transistors

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1) The transistor in the diagram is a _______ transistor.

Choice 1
pnp
Choice 2
npn
Choice 3
amplifying
Choice 4 auto switch


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2) The potential of terminal C should be ________ when it is connected to a circuit.

Choice 1
positive
Choice 2
negative
Choice 3
neutral

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3) Which of the following is not true regarding the transistor circuit in the diagram?

Choice 1
The emitter-base diode is forward bias.
Choice 2
The collector-base diode is reverse bias.
Choice 3
The resistance of the transistor will be very low if S1 is switched on.
Choice 4 The resistance of the transistor will increase when switch S2 is switched on.


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4) The diagram shows a transistor circuit. Which of the following is true about the current I1, I2 and I3?

Choice 1
I1 = I2 = I3
Choice 2
I1 < I3 < I2
Choice 3
I1 = I3 , I3 < I2
Choice 4 I2 < I1 < I3


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5) The diagram shows a transistor being used as a current amplifier. The current I1 will increase when

Choice 1
The current I2 increase.
Choice 2
The current I2 decrease.
Choice 3
The current I3 increase.
Choice 4 The current I3 decrease.


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6) The resistance of a LDR will _________ when the surrounding is bright.

Choice 1
increase
Choice 2
decrease
Choice 3
remian unchange
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7) The diagram shows a circuit of an automatic switch. The bulb will light up when

Choice 1
the surrounding is bright.
Choice 2
the surrounding is dark.
Choice 3
the surrounding is cool.
Choice 4 the surrounding is hot.


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8) The diagram shows a circuit of an automatic switch. What is the function of the 1kW resistor?

Choice 1
To limit the base current.
Choice 2
To limit the collector current.
Choice 3
To limit the emitter current.
Choice 4 To limit the resistance in the transistor.


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electromagnetism notes